Recent answers to google Search by image no resulthttps://support.mozilla.org/en-US/questions/9473452013-01-30T12:30:15-08:00Kent1026, could you please ask a new question to further assist you properly. Thanks!
2013-01-30T12:30:15-08:00feer56https://support.mozilla.org/en-US/questions/947345#answer-403291

Really thanks.
I followed the steps, but this problem still occurred.
I even try to delete all of th2013-01-20T01:05:16-08:00beboundhttps://support.mozilla.org/en-US/questions/947345#answer-399769

Really thanks.
I followed the steps, but this problem still occurred.
I even try to delete all of the firefox files and install 18.0.1,still not work.
Thanks again for your help。

The Reset Firefox feature can fix many issues by restoring Firefox to its factory default state whil2013-01-19T11:13:42-08:00feer56https://support.mozilla.org/en-US/questions/947345#answer-399588

The Reset Firefox feature can fix many issues by restoring Firefox to its factory default state while saving your essential information.
Note: This will cause you to lose any Extensions, Open websites, and some Preferences.

To Reset Firefox do the following:

Go to Firefox &amp;gt; Help &amp;gt; Troubleshooting Information.

Click the "Reset Firefox" button.

Firefox will close and reset. After Firefox is done, it will show a window with the information that is imported. Click Finish.

It's amazing that once I login google, I can't use search by image, I checked each cookie from googl2013-01-19T01:36:59-08:00beboundhttps://support.mozilla.org/en-US/questions/947345#answer-399450

It's amazing that once I login google, I can't use search by image, I checked each cookie from google and find that once I delete a cookie named "pref",the problem disappeared(But the cookie will appear once I refresh the page)... Could you please help me to analyze what cause this problem, thank you.

I am glad to hear. Thanks for reporting back.
2013-01-17T19:21:15-08:00feer56https://support.mozilla.org/en-US/questions/947345#answer-398990

I am glad to hear. Thanks for reporting back.

Really thank you,after I clear the cookie, it works.
2013-01-17T19:19:17-08:00beboundhttps://support.mozilla.org/en-US/questions/947345#answer-398988

Really thank you,after I clear the cookie, it works.

Many site issues can be caused by corrupt cookies or cache. In order to try to fix these problems, t2013-01-17T08:12:41-08:00feer56https://support.mozilla.org/en-US/questions/947345#answer-398806

Many site issues can be caused by corrupt cookies or cache. In order to try to fix these problems, the first step is to clear both cookies and the cache.
Note: This will temporarily log you out of all sites you're logged in to.
To clear cache and cookies do the following:

Go to Firefox &amp;gt; History &amp;gt; Clear recent history or (if no Firefox button is shown) go to Tools &amp;gt; Clear recent history.

Under "Time range to clear", select "Everything".

Now, click the arrow next to Details to toggle the Details list active.

From the details list, check Cache and Cookies and uncheck everything else.

Try the Firefox Safe Mode to see how it works there. The Safe Mode is a troubleshooting mode, which disables most add-ons.

(If you're not using it, switch to the Default theme.)

You can open the Firefox 4.0+ Safe Mode by holding the Shift key when you use the Firefox desktop or Start menu shortcut.

Or use the Help menu item and click on the Restart with Add-ons Disabled... menu item while Firefox is running.

Don't select anything right now, just use "'Start in Safe Mode"To exit the Firefox Safe Mode, just close Firefox and wait a few seconds before using the Firefox shortcut (without the Shift key) to open it again.If it is good in the Firefox Safe Mode, your problem is probably caused by an extension, and you need to figure out which one.